First Online: 30 September 2008Received: 26 February 2008Revised: 30 June 2008Accepted: 02 September 2008

Abstract

We address the topic of spatial-downscaling video transcoder in DCT-domain. The proposed techniques include the hierarchical fast motion resampling HFMR with accuracy motion resampling, the fast refinement for nonintegral FRNI motion vector MV, and the dynamic regulating search DRS with low-complexity motion vector refinement. Two kinds of motion vector refinement algorithms in DRS are designed for different architectures and applications. Based on brute-force motion compensation in DCT-domain MC-DCT, FRNI can provide better quality than nonrefine MV and reduce the complexity. DRS can utilize the filter for half-pixel MV in MC-DCT and it is an efficient method for extracting MC-DCT block to improve the performance further. From the experiments, the proposed algorithms can improve the entire quality and also reduce the complexity for DCT-domain video transcoder.